Flat-bed printing machines



Sept. 24, 1957 E GERICKE 2,807,466

v FLAT-BED PRNTING MACHINES Filed April 24, 1952 2 Sheets-Sheet-l Sept. 24, 1957 Filed April 24, 1952 E. GERICKE FLAT-BED PRINTING MACHINES 2 Sheets-Sheet 2 fm/enor. ,37 flic Ger/LQ,

y A Patented sept. 24 1951 FLAT-BED PRINTING MACHINES Erich Gericke, Berlin-Steglitz, Germany Application April 24, 17952, Serial No. 284,055

Claims priority, application Germany .April 26, 1951 4 Claims. (Cl. 271-59) The invention relates to a pulling-mark head on printing machines, especially offset machines, wherein a 4castor is provided to press a sheet of paper periodically -on arpulling rail located beneath it and thereby pulls a sheet of paper against `a stop arranged at the pullingmark head and being adjustable with said head.

It is an object of the invention to :provide a pullingmark operating with va castor for right-hand and lefthand application. It is suggested according to the invention to provide the pulling-mark head with one castor and on `both sides of the castor with a stop each, or with one stop and one swingable castor on the rightand left-hand side of the stop, or with vtwo castors and a stop arranged between these castors or on both sides of the castor-pair with a stop each and ybeing applicable by means Vof turning on or turning olf the stop or by means of swinging of one roll and displacement on the traverse .for desired right-hand or left-hand application.

Printing machines provided with adjustable sidemarks over the whole width of 'the applying table vhave been known so far, on which the sheet of paper can be arranged on both sides and wherein the adjusting head is adjustable for right-hand and left-hand application as well. On these hitherto known printing machines the sheet of paper was not adjusted by pulling but by pushing. It is an object of the present invention to provide a pulling-mark operating with castors for right-hand and left-hand application.

The rail or castor effecting the pulling movement of the pulling-mark head is arranged between the frontmark and the side stops. The pulling rail can be divided transversely and pulls on the right half towards the right and on the left half towards the left-hand side, so that the pulling-mark head has to be adjusted only towards the right-hand side. According to another feature of the invention, a continuous pulling rail can be provided which by shifting of the drive for said rail can be brought to a reverse pulling movement accordingly as to whether the pulling mark head is to be used for right-hand or left-hand application.

Embodiments of the invention are shown in the drawings in which:

Figure 1 is a front elevation, partly in section, of the pulling head situated on the right-hand side edge, the pulling head comprising one castor and two stops;

Figure 2 is 'a side elevation of the pulling head;

Figure 3 is a plan of the printing sheet and of the stops which determine the position of the printing sheet;

Figure 4 is an elevation of the'pulling rail for the printing sheet;

Figure 5 is an elevation of a pulling head with two castors and one stop;

Figure 6 is an elevation of a pulling head with one castor and one stop;

Figure 7 is an elevation of 'a pulling head with two castors and two stops; and

Fig. 8 shows a detail of a further embodiment of the invention.

Co-operating with the pulling head 1 is a ledge 2 which carries out the pulling movement and which lies transversely vof the direction 'of running. of the paper 4 sheet 3 in the vicinity of the front edge of the sheet and beneath the paper. A castor 4, which is periodically moved up and down, of the pulling head presses the sheet 3 that is to be straightened on to the ledge or rail 2, so that the sheet 3 is pulled by these castors 4 to the side stop 12. The periodic up and down movement of the pulling head 1 is eiected by` the cam 6 through a bell-crank lever 7,*which acts upon a cross-bar 8. The pulling movement of the ledge 2 is effected from a cam disc 16 which, with an Vinclined surface, dsplaces the arm` 18 of the ledge 2 horizontally.

According to the invention, the casing 9 of the pulling head 1 is mounted on the cross-bar 8, so that the casing can be displaced over the whole width of the paper and can be clamped in any desired position by means of Va clamping screw 10. x

In the construction represented in Fig. l, the casing 9'carries a'castor 4 andtwo paper-stop marks 11 and 12 which are acted upon by spring pressure and can be locked in their position of rest by clamping screws 13vr and 14. Only one of these stop `marks will Abe required at any time, whilst the unused stop mark, for example the mark 11 in Fig. l, will be pulled up and fixed lby the clamping screw 13.

When a sheet 3 (Fig. 2) is yinserted in the direction yof i the arrow A, it is first straightened on its front edge at the front mark 15. After this :has been eifected, the

castor V4 is put on the sheet 3 and the side rail or ledge 2 located beneath it carries out the pullingmovement to the right indicated by the arrow B, so that the sheet 3 is pulled to the stationary mark 12. When this is done, the sheet 3 remains located in yfront of the mark 12, whilst the transverse rail 2 moves on through a small distance. When the transverse rail 2 comes to rest, the castor 4 -is raised, owing to the Yperiodic lifting movement of the cross bar 8 by the action'of the cam A6 on the bellcrank lever 7, from the sheet 3 which .now lies straightened at the front mark and at the right-hand side mark 12.

The front mark 15 then effects a further slight straightening of the front edge of the sheet. The cylinder grippers then seize the sheet and lead it to the printing operation whilst, at the same time, the front mark 15 swings out and frees the path for the sheet 3.

If the sheet is to be straightened on the left-hand edge of the paper, the' clamping screw 10 is loosened and the whole pulling-mark head 1 is pushed to the left-hand side of the machine. The right-hand stop 12, which is no longer required, is pushed up and is fixed by its clamping screw 14, whilst the clamping screw 13, which holds the stop 11, is loosened, so that the Stop 11 occupies, under the action of its spring, the bottom position which is represented by dot-and-dash lines on the left ofl Fig. 1 and in which it acts as a stop for the left-hand side of the sheet. Since, now, the pulling movement of the spring-controlled ledge 2 must take place in the opposite direction, the cam disc 16 is, after loosening the squareheaded screws 19, rotated about its axis through so that, on the straightening of the sheet on the left-hand side edge, the opposite inclined surface 20 acts against the stop 11.

Fig. 4 shows `a construction of the rail 2 which carries out the pulling movement, in which the rail is divided into sections 21 and 22 which are forced apart by a spring 23 and rest, with their castors 24 and 25, on cams 26 and 27 respectively mounted at opposite ends of the machine.

. 3 y The right-hand half 21 of the rail then pulls to the right and the left-hand half 22 of the rail then pulls to the left on the straightening of the sheet.

" Fig. S shows apulling-mark head 1 which comprises two castors 28 and 29 as well as a stop 30 located between them. In order to straighten thevright-hand edge of the sheet (seen in Fig. l), the right-hand castor 29 is raised and fixed, whilst, in order to straighten the left-hand edge of the sheet, the pulling-mark head 1 is pushed on the cross-bar 8y to the 1efthand side of the machine and the left-hand castor 28 is raised and fixed whereas the righthand` castor 29 is released and lowered.

Fig. 6 shows a pulling-mark head 1 which carries a stationary stop 31 and a single castor 34 which can be swung about the pivot 32` and is mounted on the arm 33. In order to straighten `the right-hand edge of a sheet, the castor is brought into the position represented in full lines whilst, in order to lstraighten the left-hand edge of a sheet, the shifting of the castor 34 into the position represented in dot-and-dash lines is etected, the pullingmarkthead 1 being, at the same time, shifted, on the cross-bar 8, to the left-hand side ofthe machine.

Fig. 7 showsa construction in which a bail 35 with two castors 36 and 37 lies on the pulling-mark head 1. Stops 38, the level of which can be adjusted, are provided outside the castors. In the position represented, the straightening ofthe right-hand edge of a sheet is effected.

Fig. 8 shows a detail of another embodiment of the invention. On the at-bed printing machine having the pulling-mark head 1, a rail is provided beneath said head, and a stationary adjustable stop is provided on said head inthe manner as shown in Figs. l-4. A castor is provided topress a paper sheet periodically on the rail beneath the head, and the rail is divided transversely into two halves, one of the halves adapted to pull the sheet to one side and the other of the halves adapted to pull the sheet to the other side so that the rail can pull the sheet towards the stationary adjustable stop on the pullingmark head. As shown in Fig. 8, the head comprises castor 39 and stationary stop 40, this last mentioned stationary stop 40 adapted to shift to the right-hand side or to the leftfhand side of castor 39 as may be required.

Advantageously, the arrangement of the rail or castor or castors that carries or carry out the pulling movement is between the front mark and the side stops.

What I claim is:

l. A sheet register for fiat-bed printing machines comprising a cross bar, a pulling head mounted upon said cross bar, a .pulling rail located below said head, means for reciprocating said pulling rail, a caster mounted in said pulling head pressing a paper sheet to be registered periodically against said rail,`a first stop mounted upon said pulling head at one side `of said caster, means for adjusting said first stop to operative or inoperative position for registering a sheet, a second stop mounted upon saidV pulling head at the other side of said caster and means for adjusting said second stop to operative or inoperative position whereby said sheet register may register said Sheet at either side thereof by moving said pulling head towards either end of said cross bar and placing the stop nearest `said end into operative position and the other stop in inoperative position.

2. A sheet register for dat-bed printing machines comprising a cross bar, means for oscillating said cross bar, a pulling head mounted upon said cross bar, a pulling rail located below said head, means for reciprocating said pulling rail, a caster mounted in said pulling head pressing a paper sheet to be registered periodically against said rail, a first stop mounted upon said pulling head at `one side of said caster, means for adjusting said first stop to operative or inoperative position for registering a sheet, a second stop mounted upon said pulling head at the other side of said caster and means for adjusting said second stop to operative or inoperative position whereby said sheet register may register said sheet at either side thereof by moving said pulling head towards either end of said cross bar and placing the stop nearest said end into operative position and the other stop in inoperative position.

3. A sheetregister as set forth in claim l wherein said rail is divided into two parts.

4. A` sheet register as set` forth in claim 1 wherein a pair of aligned casters are mounted in said pulling head between said irst and second stops.

References Cited in the tile of this patent UNITED STATES PATENTS 1,092,912 Hollings Apr. 14, l9l4 1,404,376 Christophel Jan. 24, 1922 1,988,791 Harrold Jan. 22, 1935 

